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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values |
Date: | Tue, 17 Nov 2015 11:57:27 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 17/11/2015 11:55, Peter Maydell wrote: > If you pass clang -fwrapv then this causes -fsanitize=undefined to > no longer complain about signed integer overflows from addition. > However the sanitizer will still complain about left shifts of > negative values. The conclusion I draw is that clang (as per > the documentation) applies fwrapv only to addition &c, not to > shifts. Ok, I'll open a bug for this. It's probably unintended, they've already fixed -fwrapv once for pointers. Paolo
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